Air cleaner, intake silencer, and carburetor housing assembly



Jan. 27, 1953 J. B. SEBOK 2,626,677

AIR CLEANER, INTAKE SILENCER, AND CARBURETOR HOUSING ASSEMBLY Filed Feb. 28, 1950 r 2 SHEETS-SHEET 1 ZZYVEJYLUF N ub/$8 0k 55619016 a a fiy jwiys Jan. 27, 1953 J ggg 2,626,677

AIR CLEANER, NTAKE ILENCER, AND

CARBURETOR HOUSING ASSEMBLY Filed Feb. 28, 1950 ASHEETS-SHEET 2 ZUVEHL 0F Josepfz BkSZJQfZ ZA7 Patented Jan. 27, 1953 AIR CLEANER, INTAKE SILENCER, ANB CARBURETOR HOUSING ASSEMBLY Joseph B. Sebok, Detroit, Mich, assignor to Hondaille-Hershey Corporation, Detroit, Mich, a corporation of Michigan Application February 28, 195i), Elerial No. 146,815

5 Ciaiins. 1 This invention relates to improvements in an air cleaner, intake silencer and carburetor housing assembly, and more particularly to an assembly for connection with a carburetor in a manner to function as a housing for the carburetor, the assembly including both air cleaning and intake silencing means although the invention may have other uses and purposes as will be apparent to one skilled in the art.

number of bolts, and utilized the customary intake horn, necessitating a clamp to connect the outlet conduit from the cleaner and silencer assembly to the intake horn. Further, where these assemblies had to be disposed at a point somewhat distant from the carburetor in order to get them under the hood of an automobile, the silencer was objectionably far from the source of sound whereby the sound had opportunity to The instant invention is an improvement upon 10 spr ad and be ampli d before reaching the s the invention set forth, described, and claimed l nss mEaIlS y detracting fI'Om the efflin my copending application entitled Combinaciency of the silencing means. tion Air Cleaner, Intake Silencer and Carbure- W th h foregoing in n it is an imp rtant tor, filed November 8, 1949, Serial No. 126,115. object of the instant invention to provide an As more fully pointed out in my above identi- 15 economical air cleaning and intake silencing asfied copendin application, it is now recognized sembly wherein the construction is such that the as essential in connection with automotive vesilencer y be tuned or varied u out a hicles and especially passenger vehicles to pro- Wide range ut t ss y of p yi vide an air cleaner to cleanse the air entering the w di d s a u a tu qulpme t carburetor, and to silence what have been termed Provision of a silence! o ou d f d fintake noises emanating from the engine through e lengthsthe carburetor. The space between the carbu- It is also an J' this invention to p retor and the hood of an automobile has in the vide an air cle and silonoins assembly for past years steadil de r a d addi t th difljassociation with a carburetor, in such manner culty of providin s m i ht hcleaning and 25 that the opening in the carburetor through which silencing means and locat them properly d sounds. coming from the engine exit is in direct math the d of n automobile. This space communication with a sound attenuating chambetween the carburetor and hood is steadily decreasing especially i th n designs of t Also a feature of this invention resides in the mobiles. Effort ha been m d t supply th O provision of an intake silencer arrangement for adequate cleaning and silencing mechanism, and association with the carburetor of an internal some of these efforts entailed the disposition of combustion engine, wherein the opening n the such mechanism at a, point remote from t carcarburetor through which sounds emanating buretor which is not desirable, while in other from e engine 9X11? Opens c y to a sound cases the cleaning and silencing mechanism had attenuating Chamber Of the er ar ea monstrous appearance when the hood of an ment so that the sounds need travel no distance automobile was raised.- whatever from the carburetor opening before One of the big difficulties with cleaning and attenuation s'u silencing assemblies heretofore known was t Still a further feature of this invention resides lack of economy in f t This was 4 in the" provision of an air cleaner and intake sipecially true where different engines requirin lencer assembly constructed so that the assemsubstantially the same air capacity were inbly fu o a a housing f r a carburetor, and volved. An assembly for one of those engines he c rburetor projects irectly into a sound would not function as an assembly for the other attenuating chamber of the assembly. of the engines, not because there were changes Another object of this invention is the pronecessary in the air cleaner portion, but because vision or" an air cleaner and intake silencer asof the noise characteristics differing between the sembly arranged to function as a housing for ines so as to req ire different silencers. Aca carburetor and which assembly can readily be cordingly, if one assembly was built for one enmade so that the entire assembly projects subgine, new dies would have to be made and utilized stantially no further above the top of the carand a new design created and tested to provide silencing equipment for the other engine.

In addition, with formerly known devices of this kind, the carburetor employed the customary heavy casting for a housing, held in place by a buretor mechanism than did carburetor housings utilized heretofore.

Still another object of this invention resides in the provision of an air cleaner and intake silencer assembly embodying a plurality of sound attenuating chambers, and which assembly may readily be varied to change the size, add or subtract attenuating chambers from the original number, without the need of providing new and expensive dies to manufacture the changed construction.

It is also an object of this invention to provide an air cleaner and intake silencer assembly in which the air cleansing means are of the liquid bath type and wherein the liquid cup may readily be removed from the air cleansing means for servicing, without requiring the entire assembly to be separated from a carburetor, even though the assembly may function as the housing for the carburetor.

A further feature of the invention resides in the provision of an intake silencer arrangement that may be connected, to a carburetor in such a manner that when sound waves from the engine exit from the carburetor they are already in a sound attenuating chamber.

Still another feature of the instant invention resides in the provision of an air cleaning and intake silencer assembly, wherein the Outlet conduit from the air cleaning means functions as a tuning tube for an attenuating chamber of the silencer means,

While some of the more salient features, characteristics and advantages of the instant invention have been above pointed out, others will become apparent from the following dis,- closures, taken in conjunction with the accompanying drawings, in which?- Figure 1 is a part central vertical sectional, part elevational view of an air cleaner and intake silencer assembly embodying improvements f h instant ention, showing th sam in operative association with the carbul'ttor of an internal combustion engine, the carburetor being illustrated in elevation, the silencing means in central vertical section, and the air cleaning means in side elevation;

Figure 2 is a bottom plan view of the air cleaner and silencer assembly or Fig. l, with the carburetor removed; and

Figure 3 is an enlarged fragmentary part cent tral vertical sectional and part .elevational view of the air cleansing means seen in the right hand portion of Fig. 1, with interior portions of the structure shown in elevation.

As shown on the drawings:

The illustrated embodiment of the instant invention is shown associated with a carburetor of the downdraft type, and of a type designed for supplying a V-8 internal combustion engine with the proper fuel mixture. Such a carburetor has two separate discharge ports, one leading to each side of the V-8 engine. It will, of course, be understood that the instant invention may qually as w ll ass c ated w th other form ctcarbur tors, in ud ng. th se having only a sin le dischar e pe ing. a sin le thro tle valv a single choke valve, etc. Except for those parts of the carburetor that need be mentioned in order to fully present the instant invention, the carburetor is illustrated only diagrammatically.

The illustrated carburetor embodies a base portion I which may be connected to an internal combustion engine in a known manner. Inside that base portion are discharge or mixingchambers in which air is mived with the liquid fuel and from which the outflow of the fuel mixture may be controlled by suitable throttle valves, not shown in the drawings. At the upperpart 4 of this base portion I is a housing support in the form of a transversely disposed platform 5 suitably ported to admit air and fuel into the chambers 2 and 3, the ports being controlled respectively by choke valves 5 and 6 controlled in unison by Way of a shaft 7 which may in turn be operated either manually or automatically.

Above the platform 4 is a suitable structure 8 containing the float chamber from which liquid fuel is delivered to the chambers 2 and 3 through discharge pipes 9 and I8, respectively, and adjacent the float chamber is a suitable structure i l containing an accelerating pump. Upstanding from the float chamber structure of the carburetor is a bolt l2 equipped with a threaded Wing nut on its outer end, by means of which the air cleaner and intake silencer assembly may be connected to the carburetor.

Heretofore, owing to the open condition of the ports controlled by the choke valves 5 and 6, and the open lower ends of the liquid fuel pipes 9 and Hi, the entire portion of the carburetor above the platform 5 was enclosed in a relatively heavy housing. The air cleaner and intake silencer assembly was separate and apart from the carburetor, and connected therewith by way of an outlet conduit clamped or otherwise secured to an intake horn carried by the carburetor housing. Such structure is unnecessary with the present invention, wherein the air cleaner and intake silencer assembly function as th 1 0 5 8 3 h arbu etor The il us ra ed. embodiment of the. i stant inent on nclu es a c s n M of u stan al y cydr ca rm an preferabl ith. its long axis po ed h r z u l v-v his casin may be pro ided w h end c os es l5 an i6 at a o e od of th ca in any ui ab e. ma ner u h as y l c seam n On the un erside thereof the casing wallis recessed as indicated at H, and this recess may be of any desirable depth, depending upon how low in relation to the carburetor it is desired to have the cleaner and silencer assembly extend. Obviously, the assembly is only limited as to its most downward position by contact with the uppermostpart of the carburetor structure. The upper part of the casing wall may also be recessed as at E8 to accommodate the aforesaid wing nut I3.

Inside the casing M, in the illustrated instance, are transverse partitions l9 and 20 which divide the interior of the casing into sound attenuating chambers, including a relatively large chamber 2| for the attenuation of the heavier sounds of relatively low frequency, a smaller chamber 22 for the attenuation of higher frequency sounds, and a still smaller chamber 23 for the attenuation of still higher frequency sounds. A tuning tube 24 connects the large chamber 3| with the next smaller chamber 22. Mounted in the partition 20 is an outlet conduit 25 through which cleaned air exits from an air cleaner structure generally indicated by numeral 26. This clean air outlet conduit 25 serves as the connection,

in the illustrated showing between the air clean ing means and the silencing means of the assembly. The outlet conduit 25 is coaxial with ut of sm er size han e a e i un tube 24, and the outlet conduit also functions as a tuning tube for the smallest silencing chamber s i h whi h communicati n s t he b one more openi gs 1 n the ou l t c u On he und rs de. the casing l pro id with a suitable opening in which a flan e, 28 is setwh h, flame is s epped ou ard y a d ow wardly as indicated at 29 to intimately embrace the top margin and edge of the platform 4 on the carburetor. Between the platform and the flange a gasket 30 may be disposed as seen clearly in Fig. 1. The device may be attached to the platform of the carburetor in air tight condition by extending the aforesaid bolt l2 through a suitable aperture 3! in the recess portion I8 at the top of the casing, and tightening the wing nut I3. With the aid of a gasket, an air tight seal is thus established.

With this arrangement, it will be especially noted that the carburetor projects directly into the attenuating chamber 2!. Sounds emanating from the engine will exit from the carburetor through the open choke valves 5 and 6, and the sound waves coming through the ports controlled by these valves will pass directly into the attenuating chamber 2| without any intermediate travel. Thus, attenuation of the major or prev dominant low wave tone coming from the engine is effected immediately with no chance of spreading or amplification of this low wave length sound.

The air cleaning means connected with the silencer arrangement above described are best seen in Fig. 3. In the illustrated instance, the air cleaner is of the liquid bath type and includes an upper casing or filter holding shell 32 on which is a cover 33 to which the aforesaid outlet con duit 25 for clean air is secured. Inside the cover there is an open chamber 34 in direct communi cation with the outlet. The filter holding shell turns inwardly at the bottom thereof and is provided with a munber of large openings 35 in the bottom face, the inner portion of the bottom of the shell being spot welded or equivalently secured to an open center tube 35. Between the center tube and the shell 32 is an annular filter mass 31 which may be of any suitable material such as curled cattle tail hair, wavy wir-e, bonded vegetable fiber, etc.

A separable casing section or liquid cup is also provided and includes an outer substantially cylindrical wall 38 of greater diameter than the filter holding shell 32 so as to leave a downwardly extending annular air inlet passage 39 therebetween. The bottom of the liquid cup turns inwardly below the inlet passage as at 45!, then drops down, and extends inwardly and upwardly as at 4|, to define a sump 42 for cleansing liquid, such as oil, therein. The upper inner end of the bottom is flanged as at 43 for free telescopic engagement with the inside tube 36 and to provide a seat for a gasket 44 upon which the lower end of the tube 36 and the adjacent margin of the bottom of the filter holder may rest. Inside the center tube is a Z bar or the equivalent 45 from which a bolt 46 depends, this bolt extending through a suitable aperture in a cap 41 closing the central opening in the liquid cup, and on the outside of the cup a wing nut 48 may be engaged with the bolt.

When it is desired to service the air cleaner, it is a simple expedient to loosen the wing nut 48, drop oil the liquid cup, empty out the accumulated dirt and cleaning liquid, refill the cup to the proper level, and attach it again to the bolt 45. It will be especially noted that in order to service the air cleaner, the entire air cleaning and intake silencing assembly need not be removed from the carburetor.

In operation, when the assembly is connected to the carburetor in the manner above described, suction created by the engine draws air in through .6 the annular inlet 39, downwardly into contact with cleansing liquid in the sump 42, and upwardly through the filter mass 31, the air then passing through the clean air outlet conduit 25 into the larger of the sound attenuating chamhers 2|. From this chamber, the air enters the carburetor to be mixed with liquid fuel through the ports governed by the choke valves 5 and 6. Sound Waves emanating from the engine will pass directly through the choke valve ports into the larger attenuating chamber 2!, wherein the predominant low tone of the engine will be effectively attenuated, while a higher tone will be attenuated in the chamber 22, and the predominant still higher pitched sound will be attenuated in the smallest chamber 23.

With this construction, it will be noted that the air cleaner and intake silencer assembly functions as a housing for the carburetor, and the attenuation of the predominant low tone occurs instantaneously, while the attenuation of the higher tones occurs as expeditiously as possible since the sound waves upon leaving the mixing chamber of the carburetor are never outside an attenuating chamber.

It will be especially noted, also, that the structure may be disposed as low as desired over the top of the carburetor. Further, with the instant arrangement it is a simple expedient to elongate the casing M or shorten this casing as may be desired to enable the assembly to be used with different engines, without resort to the making of new dies and expensive tools for that purpose. The end caps l5 and 6 of the casing need not be changed, and the central portion or body of the casing 14 is merely a simple rolling job, any die work needed for the indentation I 1 being the same for any length casing. Obviously, the tuning tubes including the tube 24 and the outlet conduit for clean air 25 may be lengthened or shortened as desired.

Briefly, the fact that the assembly functions as a housing for the carburetor, the silencing arrangement may be varied at will without the necessity of new dies and tools, the air cleaner may be serviced without removing the entire assembly from the carburetor, and the fact that the attenuation chambers are as close as possible to the source of sound, individually and collectively render the instant invention highly desirable, versatile, and extremely economical.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

1. In an air cleaner and intake silencer assembly for association with a carburetor, a casing, transverse partition means in said casing dividing the same interiorly into a plurality of sound attenuating chambers, air cleaning means, an outlet conduit from said air cleaning means extending into said casing a predetermined distance and terminating in a free end to function as a tuning tube for one of said chambers, and said casing having an opening in the wall thereof directly into one of said chambers for the reception of a carburetor.

2. In an air cleaner and intake silencer assembly, an elongated casing closed at the ends, partitions in said casing defining at least three sound attenuating chambers of different sizes, air cleaning means associated with said casing, an outlet conduit from said air cleaning means extending into said casing and through one of 7 said chambers, said conduit having an opening therein to establish communication with said one chamber, a tuning tube coaxial with but of larger crossesectiona'l area than said conduit in the wall between the second and third chambers and into which said conduit freely extends to terminate in a free open end, and said casing having an opening in the side thereof leading into a chamber other than said one chamber for the reception of a carburetor.

3. In combination, a down-draft carburetor including a base portion having a passage therethrough, a platform on said base portion, and a partially enclosed choke Valve in said passage adjacent said platform, and an intake silencer including a casing defining an interior sound attenuating chamber of the resonator type, said casing having an opening in the wall thereof, a sealing flange associated with said opening for contact with said platform with the upper part of said carburetor extending into said chamber to Complete the. enclosing of said valve, air cleaning means, and an outlet conduit from said air cleaning means in open communication with said chamber.

4,. In combination, a down-draft carburetor having a partially enclosed choke valve through which both air and fuel may pass, and an intake silence-r including a casing defining an interior sound attenuating chamber of the resonator type sized to neutralize the fundamental tone of the engine with which the carburetor is associated, means for supplying air to said chamber, and said casing having an opening through the wall of said chamber for receiving at least a part of said carburetor with said valve in direct communication with said chamber and said casing formnig a housing for the received portion of the carburetor and completing the enclosing of said valve.

5. In combination, a carburetor having a partly covered region wherein air and fuelcontact each other, and "an m-take silencer including a casing having a sound attenuating chamber which functions on the resonator principle and is sized to neutralize the fundamental tone of the engine with which the carburetor is associated, and said casing having an opening in a wall of said chamber through which the carburetor extends sufiiciently for said casing to complete the covering of said reg-ion, and means to admit air to the casing.

6. In combination, a carburetor having a partly covered region wherein air and fuel contact each other, and an intake silencer including a casing having a sound attenuating chamber which functions on the resonator principle and is sized to neutralize the fundamental tone of the engine with which the carburetor is associated, and said casing having an opening in a wall of said chamber through which the carburetor extends sufiiciently for said casing to complete the covering of said region, air cleaning means connected to said casing, and a clean air outlet conduit from said cleaning means discharging into said chamber.

JOSEPH B, SEBOK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,214,731 Kamrath Sept. 17, 1940 2,287,806 Kamrath June '30, 1942 2,316,527 Mieras Apr. 13, 1943 FOREIGN PATENTS Number Country Date 880,537 France Jan. i9 1?) 

